High Density Presort. Incentive Lettermail presortation option which requires a high density of identical items per delivery mode in each mailing. At least 80% of the deposit must consist of a minimum of 50 pieces per delivery mode/rural delivery facility. The remaining mail (up to 20%) must have a minimum of 5 pieces per delivery mode/rural delivery facility. (tri préliminaire à haute densité – TPHD)
High Density Plasma. is a gas that has been excited to a level that electrons are leaving the outer orbits of each atom of the gas. When the electron leaves the orbit, it emits light. This is the process that illuminates fluorescent light bulbs. Novellus HDP (deposited on the SPEED platform) however, is much denser—there are more ions and electrons in a smaller volume excited with much higher voltages.
High Density Packaging - collective term for new electronic assembly packaging technologies
High Density Plasma. A plasma featuring high concentration of free electrons, and hence, high concentration of ions.